| Star Fisheries Cafe & Takeaway UK Ltd | Wholesale & retail | 2022 |
| Station Mini Market Castleford Ltd | Wholesale & retail | 2026 |
| Steadfast Converting Ltd | Administrative & support | 2020 |
| Steads Energy Projects Ltd | Construction | 2024 |
| Steadwell Services Ltd | Construction | 2014 |
| Stealth Recovery & Transport Services Ltd | Wholesale & retail | 2024 |
| Steel Monkey Fabrication Ltd | Manufacturing | 2024 |
| Stefan MSM Ltd | Transport & logistics | 2021 |
| Stephaniethornton Ltd | Professional & scientific | 2020 |
| Stephensons Newsagents Limited | Wholesale & retail | 2002 |
| Steponsign Limited | Manufacturing | 2014 |
| Steve Howdle Limited | Professional & scientific | 2008 |
| Sthuli S’Thuli Engineering Ltd | Professional & scientific | 2024 |
| Stixy Digital Ltd | Wholesale & retail | 2026 |
| STM 360 Consultancy Limited | Construction | 2020 |
| STM 360 Group Limited | Construction | 2020 |
| STM 360 Holdings Limited | Construction | 2002 |
| STM 360 Limited | Construction | 2016 |
| STM 360 Management Limited | Construction | 2023 |
| STM 360 Trustee Limited | Administrative & support | 2022 |
| Stockrail International Limited | Manufacturing | 1988 |
| Stonehouse Commercial Finance Limited | Financial services | 2009 |
| Stones & SON Builders Ltd | Construction | 2021 |
| Store IT Caravan Storage Ltd | Administrative & support | 2025 |
| Store IT Self Storage Ltd | Administrative & support | 2024 |
| Stott Associates Limited | Real estate | 2007 |
| Straight Funnel Limited | Education | 2025 |
| Straight to the Point Estate Agents Limited | Real estate | 2024 |
| Straw Jonny Ltd | Information & communication | 2013 |
| Stros Consulting Limited | Professional & scientific | 2019 |
| Stuart & Stacey LLP | | 2022 |
| Studio NP Limited | Professional & scientific | 2021 |
| Suffolk Energy Partnerships Limited | Professional & scientific | 2020 |
| Suhari Limited | Construction | 2014 |
| Sultan Gujrat Ltd | Hospitality | 2024 |
| Summer House Europe Ltd | Financial services | 2024 |
| Sunderland Property Ltd | Real estate | 2017 |
| Sunflower Daycare Ltd | Health & social care | 2021 |
| Suntime Beauty & Tanning Ltd | Other services | 2018 |
| Super Pound Discount Shop Limited | Wholesale & retail | 2021 |
| Supplement Support Ltd | Wholesale & retail | 2024 |
| Supreme Surfaces Yorkshire Ltd | Construction | 2025 |
| Surrey Energy Parnerships Limited | Professional & scientific | 2020 |
| Susantrans Ltd | Transport & logistics | 2021 |
| Suzanne Kohler Hair Limited | Other services | 2010 |
| Swift Brick Profiles Ltd | Manufacturing | 2025 |
| Swiftly Properties (Yorkshire) Ltd | Real estate | 2026 |
| Swiftly Roofing Ltd | Construction | 2023 |
| Switched on (Yorkshire) Ltd | Construction | 2017 |
| Synerforte UK Limited | Information & communication | 2007 |
| Syscada Green Technologies Limited | Information & communication | 2023 |
| Sysservers Limited | Extraterritorial | 2007 |
| System Hygienics Holdings Limited | Financial services | 2019 |
| System Hygienics Limited | Construction | 1976 |
| T Herrington Building Services Limited | Construction | 2012 |
| T J Interiors (Yorkshire) Ltd | Construction | 2024 |
| T&H Properties Ltd | Real estate | 2025 |
| Tabardo Ltd | Wholesale & retail | 2024 |
| Tailor Mouse Ltd | Wholesale & retail | 2011 |
| Tailored Consult Limited | Professional & scientific | 2026 |
| Target Components EOT Limited | Administrative & support | 2021 |
| Target Components Limited | Wholesale & retail | 1995 |
| TAS Surveying Limited | Professional & scientific | 2021 |
| Taylor's Commissioning Services Limited | Professional & scientific | 2009 |
| Tbgr Couriers Limited | Transport & logistics | 2026 |
| Teamsponsorhub Ltd | Information & communication | 2026 |
| Tejm Property Limited | Real estate | 2025 |
| Telecommunication Devices Ltd | Wholesale & retail | 2024 |
| Temma Group Ltd | Transport & logistics | 2019 |
| Testing Services (UK) Limited | Construction | 2003 |
| Teva Acquisition Limited | Professional & scientific | 2004 |
| Teva Laboratories UK Limited | Manufacturing | 1954 |
| Teva Pharma Holdings Limited | Manufacturing | 2016 |
| Teva Pharmaceuticals Limited | Manufacturing | 1972 |
| Teva UK Holdco 1 Limited | Manufacturing | 2019 |
| Teva UK Holdco 2 Limited | Manufacturing | 2019 |
| Teva UK Holdco 3 Limited | Manufacturing | 2019 |
| Teva UK Limited | Manufacturing | 1935 |
| TGA (Castleford) Ltd | Arts & recreation | 2025 |
| TGA Shop Ltd | Wholesale & retail | 2025 |
| TH Couriers Ltd | Transport & logistics | 2020 |
| TH Glasshoughton Bidco Limited | Administrative & support | 2018 |
| THE Anchor (Allerton Bywater) Limited | Hospitality | 2009 |
| THE Bridge Community Care Limited | Health & social care | 2017 |
| THE Butcher and the Baker Limited | Wholesale & retail | 2019 |
| THE Career Cabin Limited | Education | 2017 |
| THE Cycle Division Ltd. | Wholesale & retail | 2001 |
| THE Door Whisperer Limited | Public administration | 2026 |
| THE Drinks Department Ltd | Hospitality | 2025 |
| THE Engine Bar & Restaurant Ltd | Hospitality | 2023 |
| THE Equine Accountants Limited | Professional & scientific | 2016 |
| THE Essential Fire Door Company Limited | Construction | 2025 |
| THE Family Restaurant Group Limited | Hospitality | 2025 |
| THE Farmers Plough Ltd | Hospitality | 2025 |
| THE Fascia Company Upvc Warehouse Ltd | Administrative & support | 2005 |
| THE Fitness Ward Ltd | Arts & recreation | 2023 |
| THE Haven Nails & Spa Ltd | Other services | 2025 |
| THE Jerk Station/Cafe Ltd | Hospitality | 2024 |
| THE Joiners Arms (Lincoln) Limited | Extraterritorial | 2012 |
| THE Kraft Hair Ltd | Other services | 2025 |